function toggleLeftNav(id) {
	var subId = "sub" + id;
	var plusMinusId = id + "plusminus";
	var subObjRef;
	var plusMinusObjRef;
	var displayOnStr;
	if (document.getElementById) {
		subObjRef = document.getElementById(subId);
		plusMinusObjRef = document.getElementById(plusMinusId);
		displayOnStr = "block";
	} else if (document.all && document.all.item) {
		subObjRef = document.all.item(subId);
		plusMinusObjRef = document.all.item(plusMinusId);
		displayOnStr = "";
	} else {
		return;
	}
	if (!subObjRef || !plusMinusObjRef) { return; }
	if (!subObjRef.style || !plusMinusObjRef.src) { return; }
	if (subObjRef.style.display == "none") {
		subObjRef.style.display = displayOnStr;
		plusMinusObjRef.src = "/images/minus.gif";
	} else {
		subObjRef.style.display = "none";
		plusMinusObjRef.src = "/images/plus.gif";
	}
}